Bug fix: Display correct info in 'Diff updated' column

This is a proposed fix for Issue 1246, which stated that both 'Last updated' and 'Diff updated' columns always display the same information.
In order to properly monitor diff updates, I added an extra column to the Diffsethistory table, which records the timestamp for the last added diff.

Testing Done

manual
python reviewboard/manage.py test

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I think you need to "git add" the evolution file (it's not visible in this change)